What Engine Is This

This forum is dedicated to the Live Steam Hobbyist Community.

Moderators: Harold_V, WJH, cbrew

User avatar
JBodenmann
Posts: 2987
Joined: Sun Oct 26, 2003 1:37 pm
Location: Tehachapi, California

What Engine Is This

Post by JBodenmann » Thu Feb 07, 2019 12:24 am

Hello My Friends
A friend gave me this print to hang in the shop. He was surprised that I didn't know what engine it was and what railroad. I'm sure that some of you would know. It's obviously a simple articulated engine but aside from that I haven't a clue.
Jack
Attachments
Aticulated.jpg

randallg
Posts: 13
Joined: Fri Oct 23, 2009 8:15 am

Re: What Engine Is This

Post by randallg » Thu Feb 07, 2019 3:23 am

With the number board on top of the headlight and shape of tender tank it is likely a great northern .
Z6 possibly ?
www.chaski.com

User avatar
Short Line Tom
Posts: 47
Joined: Tue Jan 03, 2017 9:35 pm
Location: Römerberg/Germany

Re: What Engine Is This

Post by Short Line Tom » Thu Feb 07, 2019 5:24 am

Northern Pacific 4-6-6-4 #5118 (Z-6)
https://www.american-rails.com/4-6-6-4. ... allery]/3/ scroll down to pic #4

Cheers!
Tom
Each new machine was made on a "used" one.

rkcarguy
Posts: 1378
Joined: Tue Aug 22, 2017 10:33 am
Location: Wa State

Re: What Engine Is This

Post by rkcarguy » Thu Feb 07, 2019 12:10 pm

What's with all the stuff on the front of the smoke box? The other one doesn't have that. It's much more easily recognizable as a challenger without it.

Mike Walsh
Posts: 678
Joined: Sun May 06, 2007 10:14 pm
Location: St. Louis, MO

Re: What Engine Is This

Post by Mike Walsh » Thu Feb 07, 2019 12:21 pm

air pumps.

User avatar
Fender
Posts: 2768
Joined: Wed May 02, 2007 8:33 pm
Location: Chattanooga TN

Re: What Engine Is This

Post by Fender » Thu Feb 07, 2019 1:52 pm

I’ve never understood why air pumps were mounted on the smokebox front vs. being mounted lower on the pilot deck or in front of the cylinders. Didn’t this prevent access to the smokebox, without having to disconnect the pumps? I know they had to go into the smokebox for monthly inspections.
Dan Watson

User avatar
Comstock-Friend
Posts: 131
Joined: Fri Apr 23, 2010 9:05 am
Location: Sun Valley, California

Re: What Engine Is This

Post by Comstock-Friend » Thu Feb 07, 2019 7:18 pm

Dan, the smoke box door is rectangular between the pumps...

User avatar
Fender
Posts: 2768
Joined: Wed May 02, 2007 8:33 pm
Location: Chattanooga TN

Re: What Engine Is This

Post by Fender » Thu Feb 07, 2019 9:55 pm

I guess they only had to take the whole smokebox front off to pull the superheaters and flues.
Dan Watson

User avatar
Bill Shields
Posts: 5720
Joined: Fri Dec 21, 2007 4:57 am
Location: Somewhere in the World
Contact:

Re: What Engine Is This

Post by Bill Shields » Thu Feb 07, 2019 11:08 pm

ease of maintenance on the air pumps...right out in the open.

Many were mounted on 'swing out' frames so that you only had to disconnect air and steam line to pivot them clear of everything
Too many things going on to bother listing them.

User avatar
JBodenmann
Posts: 2987
Joined: Sun Oct 26, 2003 1:37 pm
Location: Tehachapi, California

Re: What Engine Is This

Post by JBodenmann » Thu Feb 07, 2019 11:16 pm

Hello My Friends
Thanks for all the info, I knew you guys would know. The main reason they put air compressors on the front of engines is that as they got bigger and the boiler diameter increased, there just wasn't clearance along side the boiler.
Jack

Rwilliams
Posts: 942
Joined: Thu Dec 22, 2005 2:45 pm
Location: Central California

Re: What Engine Is This

Post by Rwilliams » Fri Feb 08, 2019 12:41 am

Placement of the pumps on the front of the smoke box not only gave a more massive appearance to the front end, but also served other real engineering purposes. One was to get more weight on the front end of an articulated locomotive which often suffered from less than perfect weight distribution causing slipping of the front engine.

If a rigid frame steamer, the placement of pumps on the front end often helped to keep the driver axle weight within the maximum allowed for the track the locomotive operated on. A bit more weight on the engine truck was often welcome when axle weights were right at the maximum allowed for track and bridges. Often times just placing the pumps on the smokebox front could take the driver weight total down a bit and keep the crew pay scale at a lower rate for the life of the locomotive.

User avatar
Fender
Posts: 2768
Joined: Wed May 02, 2007 8:33 pm
Location: Chattanooga TN

Re: What Engine Is This

Post by Fender » Fri Feb 08, 2019 11:19 am

There are a number of reasons to put the pumps on the front. In addition to what has been said, it facilitated them being run on superheated steam, if the loco had a front-end throttle. But what I was getting at was why put them on the front of the smokebox vs. on the pilot like many other modern engines had. I guess there wasn’t enough room in some cases.
Dan Watson

Post Reply